<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数管理</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区 -->
    <el-card>
      <!-- 头部的警告区域 -->
      <el-alert title="注意:只允许第三级分类设置相关的参数" type="warning" :closable="false" show-icon></el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类:</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader expand-trigger="hover" v-model="selectedCateKeys" :options="catelist" :props="cateProps"
            @change="handleChange">
          </el-cascader>
        </el-col>
      </el-row>

      <!-- tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数
          </el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row
                )">{{ item }}</el-tag>

                <!-- 输入的文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue"
                  ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑
                </el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性
          </el-button>

          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row
                )">{{ item }}</el-tag>

                <!-- 输入的文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue"
                  ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑
                </el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>


    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
      <el-form ref="addFormRef" :rules="addFormRules" :model="addForm" label-width="150px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
      <el-form ref="editFormRef" :rules="editFormRules" :model="editForm" label-width="150px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
import api from '@/api/index'
export default {
  name: 'Params',
  data() {
    return {
      //商品分类列表
      catelist: [],
      //级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      //级联选择框双向绑定的数据
      selectedCateKeys: [],
      //被激活的页签的名称
      activeName: 'many',
      //动态参数的数据
      manyTableData: [],
      //静态属性的数据
      onlyTableData: [],
      //展示和隐藏 添加
      addDialogVisible: false,
      //添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      //验证添加表单的规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      //修改参数的表单
      editForm: {},
      // 验证修改表单的规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      //展示和与隐藏修改参数的对话框
      editDialogVisible: false,
      // 控制文本框和按钮的显示
      inputVisible: false,
      //文本框中输入的内容
      inputValue: ''
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有的商品分类
    async getCateList() {
      const result = await api.getCateList({})
      if (result.meta.status !== 200) return this.$message.error('获取商品分类失败!')
      this.catelist = result.data
      console.log(this.catelist);
    },
    //级联选择框选中项变化,会触发这个函数
    handleChange() {
      this.getParamsData()
    },
    //tab页签点击事件处理的函数
    handleTabClick() {
      this.getParamsData()
    },
    //获取参数的列表数据
    async getParamsData() {
      //如果选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }

      //根据所选分类的ID和当前所处的面板,获取对应的参数
      const result = await api.getCateselDate({
        id: this.cateId,
        params: {
          sel: this.activeName
        }
      })
      console.log(result);
      if (result.meta.status !== 200) return this.$message.error('获取参数列表失败!')


      result.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        item.inputVisible = false
        item.inputValue = ''
      })


      if (this.activeName === 'many') {
        this.manyTableData = result.data
      } else {
        this.onlyTableData = result.data
      }
    },
    //监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    //点击按钮添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const result = await api.addParamsDate({
          id: this.cateId,
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName

        })
        if (result.meta.status !== 201) return this.$message.error('添加参数失败!')

        this.$message.success('添加参数成功!')

        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    //点击按钮,展示修改对话框
    async showEditDialog(attrId) {
      //查询当前参数的信息
      const result = await api.getIdCateParams({
        id: this.cateId,
        attrId: attrId,
        params: {
          attr_sel: this.activeName
        }
      })
      if (result.meta.status !== 200) return this.$message.error('获取参数信息失败!')
      this.editForm = result.data
      this.editDialogVisible = true
    },
    //监听修改参数对话框的关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    //点击修改按钮 添加参数
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return

        const result = await api.setCateParams({
          id: this.cateId,
          attrId: this.editForm.attr_id,
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (result.meta.status !== 200) return this.$message.error('修改参数失败!')
        this.$message.success('修改参数成功!')
        this.editDialogVisible = false
        this.getParamsData()
      })
    },
    //根据ID删除对应的参数
    removeParams(attr_id) {
      this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(async () => {
        const result = await api.deleteCateParams({
          id: this.cateId,
          attrid: attr_id,
        })
        if (result.meta.status !== 200) return this.$message.error('删除分类参数失败!')
        this.$message.success('删除分类参数成功!')
        this.getParamsData()
      }).catch(() => {
        this.$message({
          type: 'info',
          message: '已取消删除'
        });
      });
    },
    //文本框失去焦点 或者按下enter键
    handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return 则证明输入的内容,需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false

      this.saveAttrVals(row)
    },
    //点击按钮展示文本输入框
    showInput(row) {
      row.inputVisible = true
      // $nextTick方法的作用,就是当页面上原生被重新渲染之后，才会指定回调函数的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    async saveAttrVals(row) {
      const result = await api.setCateParams({
        id: this.cateId,
        attrId: row.attr_id,
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })

      if (result.meta.status !== 200) return this.$message.error('修改分类参数失败!')

      this.$message.success('修改分类参数成功!')
    },
    //删除对应的参数可选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    //如果按钮需要被禁用,则返回true,否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    //当前选中的三级分类的id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    //动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  },

}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0px;
}

.el-cascader {
  margin-left: 10px;
}

.el-tag {
  margin: 10px;
}

.input-new-tag {
  width: 120px;
}
</style>